ivaynberg/select2 — pull request #1751 by MortenHoustonLudvigsen (2013-09-26 09:52:02+00:00)
Title: Introduced getOuterHeight and getOuterWidth

getOuterHeight and getOuterWidth use element.getBoundingClientRect (if
available) to get the height or width with fractions. jQuery.outerHeight
and jQuery.outerWidth truncate to an integer, sometimes giving a
slightly incorrect result.

This gave a slight misalignment when using select2 with bootstrap 3.